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I keep looking at the Rapid Box Duo myself.
It does allow for two Speedlites mounted to the outside of the softbox. Since I was an early adaptor to the Canon 600 EX-RT system , this is not a huge issue for me. Add the reflector disk for a large Beauty dish look that is portable. Nice.
If you have the radio based Speedlite system, a less expensive option is the Apollo Orb. Buy a triple flash holder and you can mount one additional light compared to the Duo. Also the Orb is 43" and about half the price.
Again there are many similarities between many of the Westcott Speedlite friendly modifiers, but enough differences as well. That is why I have All of the Apollo's, minus the 50" Mega and the Rapid Box Octa and Strip. Depending on the mood, look, location, venue determines which to bring. For event work, the Westcott Octa Mini has its place as well moving through the crowd for example.
Go grab the Rapidbox Duo and report back to us. Why not?
Canon 5D Mark III (x2), BG-E11 Grips, 7D (x2) BG-E7 Grips, Canon Lenses 16-35 f/4 L IS, 17-40 f/4 L, 24-70 f/4 L IS, 70-200 f/2.8 L IS II, 70-200 f/4 L IS, 70-200 f/4 L IS Version II, 100-400 f/4.5-5.6 L IS Version II, TS-E 24 f/3.5 L II, 100 f/2.8 L Macro IS, 10-22 f3.5-4.5, 17-55 f/2.8 L IS, 85 f/1.8, Canon 1.4 Extender III, 5 Canon 600 EX-RT, 2 Canon ST-E3 Transmitters, Canon PRO-300 Printer